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Java > Open Source Codes > com > Yasna > forum > tags > AllowPrivateReplyTag


1 /**
2  * Copyright (C) 2001 Yasna.com. All rights reserved.
3  *
4  * ===================================================================
5  * The Apache Software License, Version 1.1
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  *
14  * 2. Redistributions in binary form must reproduce the above copyright
15  * notice, this list of conditions and the following disclaimer in
16  * the documentation and/or other materials provided with the
17  * distribution.
18  *
19  * 3. The end-user documentation included with the redistribution,
20  * if any, must include the following acknowledgment:
21  * "This product includes software developed by
22  * Yasna.com (http://www.yasna.com)."
23  * Alternately, this acknowledgment may appear in the software itself,
24  * if and wherever such third-party acknowledgments normally appear.
25  *
26  * 4. The names "Yazd" and "Yasna.com" must not be used to
27  * endorse or promote products derived from this software without
28  * prior written permission. For written permission, please
29  * contact yazd@yasna.com.
30  *
31  * 5. Products derived from this software may not be called "Yazd",
32  * nor may "Yazd" appear in their name, without prior written
33  * permission of Yasna.com.
34  *
35  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38  * DISCLAIMED. IN NO EVENT SHALL YASNA.COM OR
39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46  * SUCH DAMAGE.
47  * ====================================================================
48  *
49  * This software consists of voluntary contributions made by many
50  * individuals on behalf of Yasna.com. For more information
51  * on Yasna.com, please see <http://www.yasna.com>.
52  */
53
54 package com.Yasna.forum.tags;
55
56 import javax.servlet.jsp.tagext.*;
57 import com.Yasna.forum.*;
58 import javax.servlet.jsp.*;
59 import java.io.*;
60
61 /**
62  * Jsp tag must be nested in Message tag. If current user can reply to
63  * current message then the body of AllowPrivateReply tag is evaluated.
64  */
65
66 public class AllowPrivateReplyTag extends TagSupport {
67
68     public int doStartTag() throws JspException {
69         try {
70             MessageTag mt = getMessageTag();
71             Authorization authToken = getAuthToken();
72             if (!mt.isAnonymous() && authToken.getUserID() != -1 &&
73                 authToken.getUserID() != mt.getUser().getID()) {
74                 return EVAL_BODY_INCLUDE;
75             }
76         } catch (Exception JavaDoc e) {
77         }
78         return SKIP_BODY;
79     }
80
81     /**
82      * Retrieve Authorization object from pageContext which give the information
83      * for currently logged user.
84      *
85      * @return Authorization object.
86      */
87     private Authorization getAuthToken() {
88         YazdState js = (YazdState) pageContext.getAttribute("yazdUserState",PageContext.SESSION_SCOPE);
89         return js.getAuthorization();
90     }
91
92     /**
93      * Search for parent Message tag.
94      * @return The MessageTag object of found, null otherwise.
95      */
96     private MessageTag getMessageTag() {
97         MessageTag mt = null;
98         try {
99             mt = (MessageTag)this.findAncestorWithClass(this,
100                 Class.forName("com.Yasna.forum.tags.MessageTag"));
101         } catch(Exception JavaDoc e) {
102         }
103         return mt;
104     }
105 }
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